The on-site Sunspot Visitors Center is open daily, 9 AM – 5 PM, throughout the summer. Guided tours are offered at 11 AM and 2 PM Friday, Saturday, and Sunday.
The observatory grounds are open and available for self guided tours from 8 AM to 6 PM. The Dunn Solar Telescope does not always operate on a regular schedule, but typical hours are in the mornings through early afternoons on weekdays. When in use, the telescope is open and visitors are welcome to see the observing room.
You can email any questions or comments to firstname.lastname@example.org.